jQuery(function($) {

    var contentButton = [];
    var contentTop = [];
    var content = [];
    var lastScrollTop = 0;
    var scrollDir = '';
    var itemClass = '';
    var itemHover = '';
    var menuSize = null;
    var stickyHeight = 0;
    var stickyMarginB = 0;
    var currentMarginT = 0;
    var topMargin = 0;
    $(window).scroll(function(event) {
        var st = $(this).scrollTop();
        if (st > lastScrollTop) {
            scrollDir = 'down';
        } else {
            scrollDir = 'up';
        }
        lastScrollTop = st;
    });
    $.fn.stickUp = function(options) {
        // adding a class to users div
        $(this).addClass('stuckMenu');
        //getting options
        var objn = 0;
        if (options != null) {
            for (var o in options.parts) {
                if (options.parts.hasOwnProperty(o)) {
                    content[objn] = options.parts[objn];
                    objn++;
                }
            }
            if (objn == 0) {
                console.log('error:needs arguments');
            }

            itemClass = options.itemClass;
            itemHover = options.itemHover;
            if (options.topMargin != null) {
                if (options.topMargin == 'auto') {
                    topMargin = parseInt($('.stuckMenu').css('margin-top'));
                } else {
                    if (isNaN(options.topMargin) && options.topMargin.search("px") > 0) {
                        topMargin = parseInt(options.topMargin.replace("px", ""));
                    } else if (!isNaN(parseInt(options.topMargin))) {
                        topMargin = parseInt(options.topMargin);
                    } else {
                        console.log("incorrect argument, ignored.");
                        topMargin = 0;
                    }
                }
            } else {
                topMargin = 0;
            }
            menuSize = $('.' + itemClass).size();
        }
        stickyHeight = parseInt($(this).height());
        stickyMarginB = parseInt($(this).css('margin-bottom'));
        currentMarginT = parseInt($(this).next().closest('div').css('margin-top'));
        vartop = parseInt($(this).offset().top);
        //$(this).find('*').removeClass(itemHover);
    }
    $(document).on('scroll', function() {
        varscroll = parseInt($(document).scrollTop());
        if (menuSize != null) {
            for (var i = 0; i < menuSize; i++) {
                contentTop[i] = $('#' + content[i] + '').offset().top;

                function bottomView(i) {
                    contentView = $('#' + content[i] + '').height() * .4;
                    testView = contentTop[i] - contentView;
                    //console.log(varscroll);
                    if (varscroll > testView) {
                        $('.' + itemClass).removeClass(itemHover);
                        $('.' + itemClass + ':eq(' + i + ')').addClass(itemHover);
                    } else if (varscroll < 50) {
                        $('.' + itemClass).removeClass(itemHover);
                        $('.' + itemClass + ':eq(0)').addClass(itemHover);
                    }
                }
                if (scrollDir == 'down' && varscroll > contentTop[i] - 50 && varscroll < contentTop[i] + 50) {
                    $('.' + itemClass).removeClass(itemHover);
                    $('.' + itemClass + ':eq(' + i + ')').addClass(itemHover);
                }
                if (scrollDir == 'up') {
                    bottomView(i);
                }
            }
        }

        if (vartop < varscroll + topMargin) {
            $('.stuckMenu').addClass('isStuck');
            $('.stuckMenu').next().closest('div').css({
                'margin-top': stickyHeight + stickyMarginB + currentMarginT + 'px'
            }, 10);
            $('.stuckMenu').css("position", "fixed");
            $('.isStuck').css({
                top: '0px'
            }, 10, function() {

            });
        };

        if (varscroll + topMargin < vartop) {
            $('.stuckMenu').removeClass('isStuck');
            $('.stuckMenu').next().closest('div').css({
                'margin-top': currentMarginT + 'px'
            }, 10);
            $('.stuckMenu').css("position", "relative");
        };
    });
});
